Thomas j



, UNITED STATES PATENT OFFICE.

. THOMAS J. HUBBELL, OF MAYFIELD, CALIFORNIA.

HAR'ROW.

SPECIFICATION forming part 0f Letters Patent No. 242,094, dated May 24, 1881.

Application filed March 5, 1881.

To all whom it may concern:

Be it known that I, THOMAS J. HUBBELL, of Mayfield, in the county of Santa Clara and State of California, have invented certain new and useful Improvements in Harrows; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings.

My invention relates to a self-cleaning harrow in which all the teeth can be simultaneously shifted from their vertical position to an angle pointing rearward, so that the dragging of the inclined teeth over the ground will strip them of any lodged weeds or other substance that may become entangled in them.`

It consists, first, in mounting the bars in l which the harrow-teeth'are held on journals in the barrow-frame, so that each bar can be partially rotated and, secondly, in connecting all the bars by means of a single transverse bar, and then connecting the said transverse bar with a lever at the rear of the harrow, so that by lmeans of the lever all the tooth-bars can'be turned simultaneously, so as to set the teeth in a raking or angular position, as hereinafter more fully described.

Referring to the accompanying drawings, Figure l is a perspective view of my improved harrow. Figs. 2 and 3 are longitudinal sections taken through the center of Fig. l.

My barrow-frame A, I make in the form of a parallelogram, so thatthe toothcarrying bars l B B B can be journaled in its side timbers. These tooth-bars can be made of wood or metal.

shown at Fig. 2. The barrow-teeth are inserted through holes in the bars B, and made tight therein in the usual way, leaving their upper ends projecting above the bars. Transversely across the middle of these bars I place a bar, G, through which a hole, d, is made directly over the center of each bar B, so that (No model.)

the upper projecting end of the middle tooth on v' each bar will pass through the hole corresponding withit. The holes d are made in the shape of a funnel, or largest at the top, so as to allow the teeth to change their angle in them.

At the middle of the rear timber of the frame A, and in line with the bar C, I secure two upward-projecting lugs, f f, between which I place and secure the lower end of a peculiarshaped lever. This lever consists'of a curved handle-bar, Gr, at its upper end, and an enlargement, h, at its lower end, which extends below the pivoted point or center about which the lever moves. This enlargement practically forms a cam or eccentric, and it has a shoulder, i', which strikes and bears against the timber of the frame, below the standards or lugs f f when the lever is standing in its vertical position. A link, j, connects this cam, at a point below the center or pivot on which the lever turns, with the transverse bar C, so that when the lever-handle is thrown forward the eccentric movement of the cam will push the bar C forward. The pressure of the bar() against the upper ends of the projecting teeth, which pass through the holes d, will rotate the bars B and throw the lower or harrowing ends of the teeth toward the rear. In this position the teeth will clean themselves by dragging over the ground. After they are cleaned they can be set vertical again by drawing the lever G to its upright position.

The lever-handle G curves downward upon itself, so that the driver can always reach it easily, Whether it he thrown forward or back. This arrangement for shifting the position of the barrow-teeth is exceedingly simple and effective.

The link j, being connected with the cam por tion of the lever below its center or pivot, will hold the barrow-teeth firmly in their harrowing position when the lever is thrown back.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

l. The barrow-frame A, having the toothcarrying bars B journaled in its sides, said middle tooth ot' each journaled ber passes, in combination with the cam or eccentric lz, with its curved handle G, and the connecting-link j, substantially as specified.

2. In :l harrow in which the teeth m'e held injournaled hars B, the connecting-bar U, with its funnel-shaped holes l applied ovel1 the npper projecting end of the middle tooth of' each har, and connected hy n link,j, with an eccentrie, h, below the center or pivotal point about', ro which I[he cam moves, substantially as specified.

In witness whereof I have hereunto set my hnnd und seal.

THOMAS J. HUBBELL. Attest:

EDWARD E. OSBORN, WM. F. CLARK. 

